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Hurricane Katrina formed over the Bahamas on 23 August 2005, and on that same day it crossed Florida as a Category 1 storm. A low pressure system's strengthening into a hurricane in less than 24 hours is unusual. Six days later, on 29 August, it made landfall in New Orleans as a Category 3 storm. (Katrina had been a Category 5 for a time while it was churning in the Gulf of Mexico.) By August 31, Katrina was an extratropical cyclone -- essentially an area of low pressure -- over Pennsylvania. The storm was considered to have dissipated completely on 3 September, but Katrina really had hurricane characteristics for eight days.

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10y ago

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